It was -3° this morning but the temperature has gone up 13° over the course of the day. What is the temperature now?
The temperature now is 10°. (-3° + 13° = 10°)
To find the current temperature, add the increase in temperature to the morning temperature.
Morning temperature: -3°
Increase in temperature: +13°
Calculating: -3° + 13° = 10°
Therefore, the current temperature is 10°.